Dihadron momentum imbalance and correlations in d+Au collisions

TL;DR

This paper uses perturbative QCD to analyze the transverse momentum imbalance in dijet and dihadron production in d+Au collisions, accounting for multiple scattering and nuclear effects, to explain experimental correlations at RHIC.

Contribution

It introduces a comprehensive calculation of momentum imbalance considering initial- and final-state scatterings and combines it with nuclear suppression effects to match experimental data.

Findings

Successfully describes dihadron correlations at RHIC.

Quantifies the impact of multiple scattering on momentum imbalance.

Links cold nuclear matter effects to observed suppression.

Abstract

We calculate in perturbative QCD the transverse momentum imbalance of dijet and dihadron production in high energy p+A (d+A) collisions. We evaluate the effect of both initial- and final-state multiple scattering, which determines the strength of this transverse momentum imbalance. Combining this new result with the suppression of the cross section in d+Au collisions, which arises from cold nuclear matter energy loss and coherent power corrections, we are able to describe the dihadron correlations measured by both PHENIX and STAR collaborations at RHIC, including mid-mid, mid-forward, and forward-forward rapidity hadron pairs.